Abstract
Complementary to existing routes, the Lewis acid catalyzed reactions of phenyldiazomethane with α-imino esters selectively produce cis -aziridine-2-carboxylates without competitive formation of enamino ester or carbene dimer byproducts.
Key words
catalysis - diazo compounds - heterocycles - imines - Lewis acids
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14 Other reported catalytic aziridine syntheses that employ Yb(OTf)3 use 10 mol%, presumably due to no optimization, see references: 4e, 4l, 4r, 4w, 4x, 4z, and 5c.
15 The only other report of a highly active Lewis acid catalyst in the synthesis of aziridines from imines with any diazo compound involves use of SnCl4 (0.05 mol% for 50% conversion in 50 min), see reference 5a.
16 In these cases, an insufficient level of Lewis acid is present to selectively decompose the trans -aziridine isomer, as has been reported in reference 4m.
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Typical Synthetic Procedure : To a CH2 Cl2 solution (5 mL) of imine 3 (216 mg, 1.04 mmol) at -78 °C was added BF3 ·Et2 O (5 mol%, 6.5 µL, 52 µmol) and the solution was stirred at -78 °C for 15 min. To this pale yellow solution was added, all at once, 4 (1.1 equiv, 327 µL of 3.5 M 4 in CH2 Cl2 ) and stirring was continued for 1.5 h at -78 °C. The reaction flask was then removed from the -78 ºC bath and stirring was continued for another 45 min during which time the reaction mixture came to r.t. The reaction mixture was diluted with CH2 Cl2 (5 mL), washed with a sat. aq solution of NaHCO3 (3 × 10 mL), dried over Na2 SO4 and filtered. The solvent was removed under reduced pressure to provide a yellow oil that was purified on silica gel by flash column chromatography using PE-EtOAc (from 95:5 to 85:15) to provide pure cis -5
[5f ]
(269.7 mg, 87%) as an off-white solid.
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